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JPH1132389

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH1132389
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus suitable for application to a small and light speaker apparatus.
[0002]
2. Description of the Related Art Conventionally, a small and light speaker device as shown in
FIG. 4 has been proposed. In FIG. 4, reference numeral 1 denotes a small-sized lightweight
speaker box made of synthetic resin or the like, and the speaker unit 3 is fixed to a speaker
mounting hole formed on the upper side of the baffle plate 2 fixed to the front surface of the
speaker box 1.
[0003]
The speaker unit 3 is configured, for example, as follows. As shown in FIG. 4, a ring magnet 4 and
a plate 5 and a yoke 6 mounted so as to sandwich the ring magnet 4 are provided, and the inner
peripheral side of the plate 5 and the center pole 6a of the yoke 6 are provided. The magnetic
gap 7 is formed. A speaker frame 8 is attached to the plate 5, and an edge 9 is provided on the
outer peripheral portion of the frame 8. The outer peripheral portion of the cone-shaped
diaphragm 10 is held by the edge 9.
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[0004]
On the other hand, a voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 10. A voice coil 12 is wound around the voice coil bobbin 11. The voice coil 12 is
formed by the plate 5 and the center pole 6a of the yoke 6. The magnetic gap 7 is inserted. A
damper 17 holds the voice coil 12 in the magnetic gap 7.
[0005]
Further, an audio signal from an input terminal 13 provided at a predetermined position outside
the speaker box 1 is supplied to a terminal 15 of the speaker unit 3 through a connection line 14,
and an audio signal from this terminal 15 is through a tinsel wire 16. To feed the voice coil 12.
[0006]
Further, a duct 18 having an opening in the same plane as the speaker mounting hole of the
baffle plate 2 is provided, and the phase of the sound emitted from the back surface of the
diaphragm 10 of the speaker unit 3 is reversed. It radiates outside and widens the low frequency
range of the sound coming out of the front of this diaphragm 10.
[0007]
The speaker apparatus as shown in FIG. 4 is characterized in that it is compact and lightweight.
However, if the diaphragm 10 of the speaker unit 3 vibrates to emit sound, the force F of the
vibration is the product of the effective mass m of the vibration system of the speaker unit 3 and
the moving acceleration of this vibration system (F = mα) Become.
[0008]
In general, when an object moves, there is action and reaction, and in the case of this speaker
device, the force of reaction is to be received by the speaker box 1. In this small and light speaker
device, the weight of the speaker box 1 is small. The force of this reaction can not be supported
by this speaker box 1.
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[0009]
Therefore, in such a conventional small and light speaker device, when the diaphragm 10 of the
speaker unit 3 vibrates for sound radiation, the speaker box 1 can support the force F of the
vibration system of the speaker unit 3. There is no weight, and the power of the radiation of the
sound is weakened to deteriorate the sound quality.
[0010]
Furthermore, also in the duct 18, the force of reaction when radiating the sound is given to the
speaker box 1, and since the speaker box 1 is lightweight, the power of the radiation of this
sound weakens and the sound quality of the bass is deteriorated. was there.
[0011]
In view of the foregoing, it is an object of the present invention to improve sound quality by
preventing the power of sound radiation from being weakened by the above-described action and
reaction force.
[0012]
A speaker apparatus according to the present invention is a speaker apparatus in which a
speaker unit for sound emission is attached to a baffle plate on one surface of the speaker box
and a duct for bass radiation is provided. The first vibrator is mounted on the face of the speaker
unit to cancel or reduce the reaction force of the speaker unit, and the second vibrator is
mounted to cancel or reduce the reaction force of the duct.
[0013]
According to the present invention, since the first exciter that cancels or reduces the reaction
force of the speaker unit is attached, and the second exciter that cancels or reduces the reaction
force of the duct is mounted. The weakening of the radiation can be improved, and the sound
quality of the small and light speaker device can be improved.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker apparatus
according to the present invention will be described below with reference to FIG.
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In FIG. 1, parts corresponding to FIG. 4 are given the same reference numerals, and detailed
descriptions thereof will be omitted.
[0015]
In the example of FIG. 1, a baffle plate 2 is provided on the front of a small lightweight speaker
box 1 made of synthetic resin or the like, and a speaker mounting hole is formed on the upper
side of the baffle plate 2. Fix 3
[0016]
The speaker unit 3 is configured, for example, as shown in FIG.
That is, the ring-shaped magnet 4 and the plate 5 and the yoke 6 attached so as to sandwich the
ring-shaped magnet 4 are provided, and the magnetic gap 7 is formed between the inner
peripheral side of the plate 5 and the center pole 6 a of the yoke 6 To do.
[0017]
A speaker frame 8 is attached to the plate 5, and an edge 9 is provided on the outer peripheral
portion of the frame 8. The outer peripheral portion of the cone-shaped diaphragm 10 is held by
the edge 9.
[0018]
On the other hand, a voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 10. A voice coil 12 is wound around the voice coil bobbin 11. The voice coil 12 is
formed by the plate 5 and the center pole 6a of the yoke 6. The magnetic gap 7 is inserted.
The voice coil 12 is held by the damper 17 in the magnetic gap 7.
[0019]
Further, an audio signal from the input terminal 13 provided at a predetermined position outside
the speaker box 1 is supplied to the terminal 15 of the speaker unit 3 through the connection
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line 14, and the audio signal from the terminal 15 is It is supplied to the voice coil 12 via
[0020]
Further, a duct 18 having an opening in the same plane as the speaker mounting hole of the
baffle plate 2 is provided, and the phase of the sound emitted from the back surface of the
diaphragm 10 of the speaker unit 3 is reversed. It radiates outside and spreads the low range of
the sound from the front of the diaphragm 10.
[0021]
In this example, the first exciter 20 is mounted at a position corresponding to the side wall 2a
facing the baffle plate 2 in the speaker box 1, that is, the speaker unit 3 on the rear surface, and
is opposed to the baffle plate 2 in the speaker box 1. The second exciter 21 is mounted at a
position corresponding to the side wall 2a, that is, the duct 18 on the rear surface.
[0022]
As the first and second vibrators 20 and 21, for example, vibrators of a speaker configuration as
shown in FIG. 2 are used.
The vibrators 20 and 21 in this example are a cylindrical center pole 34a embedded in the center
of a disk-shaped plate material, and a magnet in which a stepped portion is formed concentrically
so as to surround the center pole 34a. A yoke 34 having an inverted T-shaped cross section in
which the guide 34b is integrated, and a ring-like magnet 33 magnetized in the thickness
direction and having an inner diameter fitted and joined to the magnet guide 34b of the yoke 34;
A magnetic circuit is constituted by a ring-shaped plate 31 joined to the upper surface of the
magnet 33 with an adhesive or the like, and a funnel-shaped frame 37 made of steel or the like is
fixed on the plate 31.
[0023]
A concentric magnetic gap 47 is formed between the center pole 34a and the inner periphery of
the plate 31, and the voice coil 38a wound around the voice coil bobbin 38 is inserted into the
magnetic gap 47.
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A corrugated concentric damper 39 is bonded between the outer diameter of the upper end of
the voice coil bobbin 38 and the bottom of the frame 37 with an adhesive or the like, and the
voice coil 38 a is held in the magnetic gap 47.
[0024]
Further, the inner diameter portion of the diaphragm 49 having a plurality of funnel-shaped vent
holes 48 is fitted to the outer diameter of the upper end portion of the voice coil bobbin 38 and
joined, and the maximum diameter portion of the diaphragm 49 is the maximum diameter of the
frame 37 Join to the opening through the arrow 42.
A dust preventing cap 44 having a plurality of vent holes 48 formed on the upper surface of the
voice coil bobbin 38 is joined.
In this case, the diaphragm 49 and the cap 44 have a plurality of vent holes 48 so that they do
not emit sound pressure.
[0025]
A lead wire is drawn from the voice coil 38a and connected to the terminal 45 through the tinsel
wire 46, and an audio signal obtained at the input terminal 13 is supplied to the voice coil 38a
via the terminal 45.
[0026]
In this example, the effective mass m of the vibration system of the speaker unit 3 for sound
emission and the effective mass m1 of the first vibrator 20 are equalized, and the lowest
resonance frequency of the speaker unit 3 and the first excitation The lowest resonance
frequency of the unit 20 is matched.
[0027]
Further, in this example, the effective mass m0 of the duct 18 and the effective mass m2 of the
second vibrator 21 are equalized, and the resonant frequency of the duct 18 and the lowest
resonant frequency of the second vibrator 21 are matched. It does like that.
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[0028]
Next, the operation of this example will be described.
When an audio signal is supplied to the input terminal 13, a force of F = mα is generated in the
speaker unit 3 as shown by the arrow F, and similarly, in the first vibrator 20, a force of F1 =
m1α1 is shown as shown by the arrow F1. A force is generated, and a force of F0 = m0 α0 is
generated in the duct 18 as shown by the arrow F0, and a force of F2 = m2 α2 is generated in
the second vibrator 21 as shown by the arrow F2.
Here, m, m1, m0 and m2 are the effective masses of the speaker unit 3, the first exciter 20, the
duct 18 and the second exciter 21, α, α1, α0 and α2 are the speaker units 3, The
accelerations of the first vibrator 20, the duct 18 and the second vibrator 21 are shown.
[0029]
As described above, when the speaker unit 3, the first exciter 20, the duct 18 and the second
exciter 21 are driven, the force of -F is counteracted against the force of the speaker unit 3 in the
F direction. Similarly, for the force of the first exciter 20 in the F1 direction, the reaction
produces a force of -F1, and the reaction for the force of the duct 18 in the F0 direction produces
a force of -F0, The force of -F2 is generated by the reaction to the force of the exciter 21 in the
direction of F2.
[0030]
In this example, the speaker unit 3 and the first exciter 20, and the duct 18 and the second
exciter 21 are disposed to face each other in the speaker box 1, so The reaction force -F of the
speaker unit 3 and the reaction force -F1 of the first vibrator 20 cancel each other, and the
reaction force of the duct 18 -F0 and the second vibrator 21 The reaction force of-acts in such a
way as to cancel each other out.
[0031]
Therefore, when -F = mα and -F1 = m1α1 are equalized and -F0 = m0α0 and -F2 = m2α2 are
equalized, the forces of this reaction of the speaker unit 3 and the duct 18 -F and -F0 Can prevent
the movement of the speaker box 1 (support the reaction force due to the radiation of sound),
and even with this small and light speaker device, it can exert almost 100% of the force of
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radiation of sound, There is a benefit to be able to obtain a high quality loudspeaker system that
is very powerful in the sound of radiation.
[0032]
Furthermore, in the present embodiment, since the force due to the reaction of the sound
radiation of the duct 18 is canceled by the second exciter 21, the force of the radiation of the
sound from the duct 18 becomes very large, and a small and lightweight Even a loudspeaker
device has the benefit of being able to emit strong bass.
[0033]
Generally, in the case of a dynamic speaker, the force F = mα applied to the diaphragm is
determined by the following equation (1).
[0034]
Here, WE is an audio signal input applied to the speaker unit 1, Bg is the magnetic flux density of
the magnetic gap of the magnetic circuit, Vv is the effective volume of the voice coil, δ is the
specific resistance of the voice coil material, and Q is the resonance sharpness of the speaker unit
Degrees.
[0035]
Since the above equation (1) can be applied to the first and second vibrators 20 and 21 described
above, the above-mentioned WE, Bg, Vv, and the speaker units 3 and the first and second
vibrators 20 and 21 can be used. It is possible to select reaction forces of -F = -F1 and -F0 = -F2
which mutually cancel out by appropriately selecting .delta., Q or m, m1, m0 and m2 under
various conditions.
[0036]
Further, in this example, the lowest resonance frequency of the speaker unit 3 and the lowest
resonance frequency of the first vibrator 20 are matched, and the resonance frequency of the
duct 18 and the lowest resonance frequency of the second vibrator 21 are matched. Therefore,
even if the speaker device is small and light in weight over a wide frequency range, it is possible
to obtain a high-quality speaker device having power in the sound of radiation over the wide
frequency range, supported by the reaction force by the radiation of sound. There is a profit that
can be done.
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[0037]
In the above example, although a general small dynamic speaker unit was used as the speaker
unit 3 in the above example, a cancel magnet oppositely magnetized to the magnetizing direction
of the magnet 4 is provided on the back of the yoke 6 instead A magnetic shield type speaker
unit provided with a shield cover may be used, or another speaker unit may be used.
[0038]
Another example of the first and second vibrators 20 and 21 is as shown in FIG.
As described with reference to FIG. 3, the portions corresponding to FIG. 2 are denoted by the
same reference numerals, and the detailed description thereof is omitted.
[0039]
In this example of FIG. 3, the configuration up to the magnetic circuit and the lower damper 39a
having air permeability is the same as the example of FIG. 2, but it is formed of a cloth etc.
between the maximum outer diameter opening of the frame 37 and the outer diameter of the
voice coil bobbin 38. The air-permeable upper damper 39b is disposed.
The outer diameter portion of the upper damper 39b is fixed to the frame 37 via the arrow 42,
and the inner diameter portion of the upper damper 39b is fixed to the upper end outer diameter
portion of the voice coil bobbin 38 with an adhesive or the like. Constitute the diaphragm.
Alternatively, the cap 44 which is covered on the upper surface of the voice coil bobbin 38 is also
selected from a breathable material such as cloth.
[0040]
In addition, in order to increase the effective mass of the vibrator, a weight 50 is provided at the
mounting portion of the voice coil bobbin 38 of the lower damper 39a, as necessary.
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It can be easily understood that the vibrator as shown in FIG. 3 can obtain the same function and
effect as the vibrator shown in FIG.
[0041]
In addition to the vibrator shown in FIGS. 2 and 3, the cancel magnet and shield cover oppositely
magnetized with the magnetizing direction of the magnet 33 on the back of the yoke 34 of the
vibrator shown in FIGS. It is good also as a magnetic-insulation type vibrator provided with.
[0042]
In the above example, the reaction force -F of the speaker unit 3 and the reaction force -F1 of the
first vibration exciter 20 are equalized, and the reaction force -F0 of the duct 18 and the force of
the second vibration exciter 21 Although the reaction force -F2 is described to be equal, it is not
necessary to equalize the reaction force since the above-mentioned action and effect can be
obtained by only canceling out the reaction force.
[0043]
Further, it goes without saying that the present invention is not limited to the above-described
example, and various other configurations can be adopted without departing from the scope of
the present invention.
[0044]
According to the present invention, the first exciter for canceling or reducing the reaction force
of the speaker unit is mounted, and the second vibrator for canceling or reducing the reaction
force of the duct is mounted. Therefore, it is possible to improve the weakening of the power of
sound radiation, and it is possible to obtain high-quality sound even with a small-capacity
speaker device.
[0045]
Further, in the present invention, since the force due to the reaction of the sound radiation of the
duct is canceled or reduced by the second vibrator, the power of the radiation of the sound from
the duct becomes very large, and the small and light weight Even a loudspeaker device has the
benefit of being able to emit strong bass.
[0046]
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Further, in the present invention, the lowest resonance frequency of the speaker unit and the
lowest resonance frequency of the first vibrator are matched, and the resonance frequency of the
duct and the lowest resonance frequency of the second vibrator are matched. Even if it is a small
and light speaker device over the range, it has the benefit of being able to support the reaction
force by the radiation of sound, and to obtain a high-quality speaker device that has power over
the sound of radiation over a wide frequency range. .
[0047]
Brief description of the drawings
[0048]
1 is a cross-sectional view showing an example of the speaker apparatus of the present invention.
[0049]
2 is a cross-sectional view showing an example of a vibrator.
[0050]
3 is a cross-sectional view showing another example of the vibrator.
[0051]
4 is a cross-sectional view showing an example of a conventional speaker device.
[0052]
Explanation of sign
[0053]
DESCRIPTION OF SYMBOLS 1 ... Speaker box, 2 ... baffle plate, 2a .. side wall, 3 ... speaker unit, 18
... duct, 20 ... 1st vibrator, 21 .. 2nd vibrator
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